Halloween Horror Nights is a Halloween event presented annually at the Universal Orlando Resort. Beginning in 1991 in Universal Studios Florida with only one haunted house, it has continued annually for 19 years to become one of the largest Halloween events in the United States. In its later years the event has split time between its original park and the more recently built Islands of Adventure. Universal's design team has created six original icons for the event and have also used many of the Universal Monsters.